android中JSONObject的使用；

今天项目上要用json数据；看了点资料，然后完成了功能；学习习惯很重要，所以把他记录下来；方便后面学习；

要解析json需要使用到JSONObject  和JSONArrays

今天要解析的json数据的格式如下：{"succeed":true,"msg":"有新版本","body":{"creatTime":null,"describe":"asdf","id":1,"location":"/cardGod.apk","name":"asdfer","versionName":"1.0.0","versionNum":100}}

{
    "body": {
        "describe": "asdf",
        "id": 1,
        "location": "/cardGod.apk",
        "name": "asdfer",
        "versionName": "1.0.0",
        "versionNum": 100
    },
    "msg": "有新版本",
    "succeed": true
}

 

更具上面格式分析，建立一个javaBean代码如下：

public class UpdateInfo {
    private String msg;
    private boolean succeed;
    private Body body;
    public static class Body {
        public static String describe;
        public static int id;
        public static String location;
        public static String name;
        public static String versionName;
        public static String versionNum;
    }
    public String getMsg() {
        return msg;
    }
    public void setMsg(String msg) {
        this.msg = msg;
    }
    public boolean getSucceed() {
        return succeed;
    }
    public void setSucceed(boolean succeed) {
        this.succeed = succeed;
    }
    public Body getBody() {
        return body;
    }
    public void setBody(Body body) {
        this.body = body;
    }

}

通过得到JSON字符串后，使用

JSONObject obj = JSONObject(String string);

 

的构造函数将字符串转换成JSONObject对象；使用该对象的getString("succeed"); 得到succeed的值；

obj.getString("succeed");

 最后，解析json的代码如下：

 */
    public static UpdateInfo getUpdateInfo(int nowversion) throws IOException,
            JSONException {

        final Map<String, Object> params = new HashMap<String, Object>();
        params.put("version.versionNum", nowversion);

        JSONObject result = HttpConn.connPost(url, params); //这里是工具类，从网络中得到数据后将其封装成JSONObject对象；
        MyLog.log(url.toString() + "         params   " + nowversion);
        boolean boo = result.getBoolean("succeed");
        String str = result.getString("msg");
        String body = result.getString("body");
        if (boo) {
            return pareUpdateInfo(body);

        }
        return null;
    }

/**
     * 该方法用于解析得到的json数组
     * 
     * @param json
     * @return UpdateInfo object
     * @throws JSONException
     * @throws Exception
     */
    public static UpdateInfo pareUpdateInfo(String json) throws JSONException {
        UpdateInfo infoObj = new UpdateInfo();

        JSONObject ja = new JSONObject(json);
        infoObj.getBody().describe = ja.getString("describe");
        infoObj.getBody().id = Integer.parseInt(ja.getString("id"));
        infoObj.getBody().location = ja.getString("location");
        infoObj.getBody().name = ja.getString("name");
        infoObj.getBody().versionName = ja.getString("versionName");
        infoObj.getBody().versionNum = ja.getString("versionNum");

        return infoObj;
    }